Conventional, hadronic matter consists of baryons and mesons made of three quarks and a quark-antiquark pair, respectively(1,2). Here, we report the observation of a hadronic state containing four quarks in the Large Hadron Collider beauty experiment. This so-called tetraquark contains two charm quarks, a (u) over bar and a (d) over tilde quark. This exotic state has a mass of approximately 3,875 MeV and manifests as a narrow peak in the mass spectrum of (DD0)-D-0 pi(+) mesons just below the D*D-+(0) mass threshold. The near-threshold mass together with the narrow width reveals the resonance nature of the state.
Aaij, R., Abdelmotteleb, A., Beteta, C.a., Gallego, F., Ackernley, T., Adeva, B., et al. (2022). Observation of an exotic narrow doubly charmed tetraquark. NATURE PHYSICS, 18(7), 751-754 [10.1038/s41567-022-01614-y].
Observation of an exotic narrow doubly charmed tetraquark
Archilli, F.;Santovetti, E.Membro del Collaboration Group
;
2022-01-01
Abstract
Conventional, hadronic matter consists of baryons and mesons made of three quarks and a quark-antiquark pair, respectively(1,2). Here, we report the observation of a hadronic state containing four quarks in the Large Hadron Collider beauty experiment. This so-called tetraquark contains two charm quarks, a (u) over bar and a (d) over tilde quark. This exotic state has a mass of approximately 3,875 MeV and manifests as a narrow peak in the mass spectrum of (DD0)-D-0 pi(+) mesons just below the D*D-+(0) mass threshold. The near-threshold mass together with the narrow width reveals the resonance nature of the state.| File | Dimensione | Formato | |
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